Transmission issues 07 denali

[Jakkel667]

I picked up 07 Yukon Denali with 165k on it last week.
I’ve notice when trans temp gets around 140-150 it’s starts shifting or not shifting till high rpms then shifts hard. If I put it in manual mode it shifts fine no slipping shift with no problems.
When I bought it last week it did have a p0700 code and a code for solenoid 5 off but can’t remember the code number.
I’m having issues with cruise not working on and off so I ordered a new brake switch wondering if it’s cause my shifting issues or could be something else. Any help is greatly appreciated.

 

[Geotrash]

I picked up 07 Yukon Denali with 165k on it last week.
I’ve notice when trans temp gets around 140-150 it’s starts shifting or not shifting till high rpms then shifts hard. If I put it in manual mode it shifts fine no slipping shift with no problems.
When I bought it last week it did have a p0700 code and a code for solenoid 5 off but can’t remember the code number.
I’m having issues with cruise not working on and off so I ordered a new brake switch wondering if it’s cause my shifting issues or could be something else. Any help is greatly appreciated.

GM 6L80 Transmission Information Thread

Hi All, Since so many of us own at least one Tahoe or Yukon equipped with a 6L80, I figured I'd start an all-encompassing transmission thread with videos, links and other information as it relates to the 6L80/90 transmissions. I'll get it going with a tear down and inspection video and go from...

www.tahoeyukonforum.com

Bon appetit!

 

[Jakkel667]

GM 6L80 Transmission Information Thread

Hi All, Since so many of us own at least one Tahoe or Yukon equipped with a 6L80, I figured I'd start an all-encompassing transmission thread with videos, links and other information as it relates to the 6L80/90 transmissions. I'll get it going with a tear down and inspection video and go from...

www.tahoeyukonforum.com

Bon appetit!

Yeah I’ve been reading thru it. Lol a lot to read. Was hoping someone had same issues and figured it out. But thank you for the link.

 

[Joseph Garcia]

@NickTransmissions

 

[NickTransmissions]

@NickTransmissions

I responded to his question in my 6L80 thread...He's going to rule in/out non-trans causes first then put a scan tool on it to see what's going on, etc...

 

[Joseph Garcia]

I responded to his question in my 6L80 thread...He's going to rule in/out non-trans causes first then put a scan tool on it to see what's going on, etc...

Perfect! Thank you Nick. You are a valued member of this Forum's team.